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Table 1 Participant characteristics by allocated response rate intervention group in the three embedded studies

From: Increasing follow-up questionnaire response rates in a randomized controlled trial of telehealth for depression: three embedded controlled studies

  8-month follow-upa (pre-call) 12-month follow-upa (photo) 12-month follow-upb (email)
  Control (n = 95) Pre-called (n = 95) Control (n = 125) Photo (n = 126) Control (n = 116) Urgent email (n = 115)
Baseline age, mean (standard deviation) 50.5 (13.1) 49.7 (13.9) 49.2 (12.6) 50.0 (14.0) 48.6 (11.4) 50.0 (12.3)
Female 68 (72) 66 (69) 89 (71) 86 (68) 73 (63) 77 (67)
Baseline Patient Health Questionnaire (PHQ-9) score 16.4 (5.0) 17.0 (4.5) 17.2 (4.9) 16.7 (4.6) 16.9 (4.8) 16.7 (4.5)
Main trial arm
 Intervention 42 (44) 51 (54) 64 (51) 59 (47) 51 (44) 61 (53)
Questionnaire completion method
 Online 36 (38) 38 (40) 57 (46) 54 (43) 46 (40) 33 (29)
 Paper 42 (44) 44 (46) 54 (43) 50 (40) 47 (41) 59 (51)
 Patient Health Questionnaire (PHQ-9) only (paper or phone) 15 (16) 8 (8) 7 (6) 14 (11) 16 (14) 12 (10)
 Not returned or withdrawn 2 (2) 5 (5) 7 (6) 8 (6) 7 (6) 11 (10)
  1. Data are reported as number (percentage), unless otherwise indicated
  2. aBased on participants recruited from the Bristol area only
  3. bBased on participants recruited from the Sheffield and Southampton areas